美国历史上军费在GDP中占比，二战时高达40%，是完全的战时经济。越战时也常年维持在10%。美国经济和科技照样飞速发展。

https://www.usgovernmentspending.com/defense_spending_history#:~:text=At%20the%20height%20of%20the%20Vietnam%20War%20in%201968%20defense,to%206.8%20percent%20in%201986.